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BaGe3Pt, tetragonal, IAmm (no. 107), a = 4.5636(2) A, c = 10.2341(6) A, V = 213.1 A, Ζ = 2, Rgi{F) = 0.030, wRtef(F) = 0.074, Τ = 293 Κ. Bao.73Euo.27Ge3Pt, tetragonal, IAmm (no. 107), a = 4.5432(1) A, c = 10.1763(2) A, V = 210.0 Α, Ζ = 2, Rgi(F) = 0.025, wRKf(F) = 0.061, Τ = 293 Κ. EuGeaPt, tetragonal, IAmm (no. 107), a = 4.4633(1) A, c = 10.0625(4) A, V = 200.5 Ä, Ζ = 2, R&(F) = 0.018, wRitiF) = 0.035, Τ = 293 Κ. Source of material A series of Bai_*EuxPtGe3 samples with χ=0,0.27 and 1 was synthesized by melting mixtures of the elemental components in a high-frequency oven. Dendritic pieces of barium (99.9 %, Alfa Aesar) and europium (99.9 %, Ames), platinum wire (99.9 %, * Correspondence author (e-mail: schwarz@cpfe.mpg.de) ChemPur) and germanium fragments (99.999 %, ChemPur) were used. Homogenization was achieved by annealing at 800 °C for 200 h and followed by quenching in cold water. Single crystals were separated from the ingots by mechanical fragmentation. Further details of the sample characterization (X-ray absorption spectra, measurements of magnetic susceptibility and electrical resistivity) and respective results are available in the CIF. Experimental details Samples were investigated by X-ray powder diffraction (Huber Image Plate Guinier camera G670, Cu&zi radiation, λ = 1.54056A, 5° < 20 < 100°, LaBe as internal standard, a = A.1569 A). Crystal structure refinements were performed using single crystal X-ray diffraction data. Interatomic distances were calculated with the resulting positional parameters and lattice parameters as refined from X-ray powder diffraction data. Discussion The continuous solid solution Bai_xEuxPtGe3 (0 < χ < 1) was investigated and the crystal structures of the boundary phases and of an intermediate composition were refined using single crystal X-ray diffraction data. The unit cell parameters within the homogeneity range decrease linearly with increasing Eu content. The da ratio of about 2.24 remains practically constant in the whole concentration interval. All Pt atoms in the structure of BaPtGe3 are five-fold coordinated by Ge species in form of a tetragonal pyramid with <f(Pt—Ge) = 2.526(1) A and 2.533(4) A to the atoms in the basis (4 χ Ge2) and in the top (1 χ Gel), respectively. The environments of the crystallographically independent germanium sites exhibit pronounced differences. The coordination of Gel atoms is similar to those of Pt (tetragonal pyramid with four Gel at 2.731(2) A and one Pt), whereas the Ge2 atoms are tetrahedrally coordinated by two Gel and two Pt atoms. Comparing these values with the sum of the Pauling's single bond radii assumed for Pt and Ge (1.30 A +1.22 A = 2.52 A) [1] and with the interatomic distances in elemental germanium (2.45 A) [2] one can consider strong Pt—Ge bonds and weak Ge—Ge interactions. The Ba—Pt distances vary between 3.564(7) A and 3.663(2) A, the Ba—Ge interactions cover the range from 3.384(1) A to 3.457(2) A. All interatomic distances in EuPtGe3 are in average 0.05 A 0.10 A shorter than those in the barium phase: d(Pt—Gel) = 2.445(2) A, d(Pt—Ge2) = 2.488(1) A, d(Ge—Ge2) = 2.681(1) A, d(Eu—Pt) = 3.488(1) A 3.547(1) A, d(Eu—Ge) = 3.299(6) A 3.415(1) A. The members of the series of Bai-*Eu*PtGe3 ( 0 < x < l ) adopt a tetragonal BaNiSn3-type crystal structure [3], which represents an ordered variety of the well known BaAU structure [4]. The finding of isotypic phases with composition 1:1:3 is remarkable since the BaAU-type variants with stoichiometry 1:2:2 are found to realize different arrangements. The structure of BaPt2Ge2 [5] is Ba(Eu) Unauthenticated Download Date | 6/6/19 3:59 AM 110 Bai_xEujrPtGe3 (χ = 0, 0.27,1) reported to adopt an inverse BaCu2St>2 type [6], which can be described as an intergrowth of fragments of the ThCr2Si2 [7] and the CaBe2Ge2 structure types [8]. In contrast, the EuPt2Ge2 phase is assumed to be isotypic to an LaPt2Ge2 atomic arrangement [9] which is a monoclinically distorted variant of the CaBe2Ge2 type. The differences between these derivatives of the BaAL» structure type are mainly restricted to the ordering of atoms in the polyanionic framework corresponding to the aluminum sites of BaALj. X-ray absorption spectra (XAS) of EuPtGe3 indicate the presence of the europium mainly in the 4 f (Eu) configuration. This finding is in accordance with the results of magnetic susceptibility measurements. EuPtGe3 exhibits a magnetic susceptibility χ(Τ) following a Curie-Weiss law over a wide temperature range. A fit for7">50K(//= 10 kOe) results in an effective magnetic moment fieB = 7.82 μβ and a Weiss parameter θ = -6.03(4) Κ (antiferromagnetic interactions), in good agreement with the properties expected for the Sin state of the 4 / 7 configuration of Eu. 1. Barium platinum trigermanium, BaPtGe3 Table 1. Data collection and handling.

Crystal structures of (barium, europium) platinum trigermanium, Ba 1-x Eu x PtGe 3 (x = 0,0.27,1)